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I'm sorry to have kept you     for a long time.A. wait B. to wait  C. waiting D. to be waiting

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wait    to wait    waiting    to be waiting  
wait    to wait    waiting    to wait  
waiting    to wait   waiting for   to wait for  
have keep  have kept  have keeping  keep  
I'm sorry.  I'm sorry to have kept you waiting.  I'm sorry to be kept waiting.  Sorry to wait so long.  
have been    have come    was    will be  
You’re welcome    Go ahead    Don’t mention it    No problem  
You' re welcome    Go ahead    Don't mention it    No problem  
kept  made  got  let  
You’re welcome   Go ahead   Don’t mention it   No problem  
have been    have come     have arrived     waited  
have been  have come   have arrived  waited  
I ’m sorry.  I ’m sorry to have kept you waiting.  I ’m sorry to be kept waiting.  Sorry to wait so long.  
wait    to wait    waiting    to be waiting  
have been   have come  have arrived   waited  
You’re welcome    Go ahead    No problem    Don’t mention it  
wait    waiting    to wait    waited  
kept  made  got  let  
wait    to wait     waiting     waited  
to keeping you  to kept you  to have kept you  kept you  

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